Borrowings (Tables)

6 Months Ended

Jun. 30, 2012

Borrowings [Abstract]

Summary of Company's financial statements

	June 30, 2012			December 31, 2011
Convertible debt principal	$	120,000		$	120,000
Unamortized debt discount		(35,952	)		(38,263	)
Net carrying amount of convertible debt	$	84,048		$	81,737

Summary of interest expense recognized

	Three Months Ended June 30,				Six Months Ended June 30,
	2012		2011		2012		2011
Contractual interest expense	$	450	$	50	$	900	$	50
Amortization of debt issuance costs		102		11		203		11
Accretion of debt discount		1,171		161		2,312		161
Net interest expense	$	1,723	$	222	$	3,415	$	222

Aggregate maturities of borrowings

The aggregate maturities of borrowings as of June 30, 2012 were as follows (in thousands):

2012	$	476
2013		53
2014		125
2015		125
2016, and thereafter		120,144
	$	120,923